Grab Sampling Systems - Swagelok ... A Swagelok Application Solution Grab Sampling Systems 6 The...

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Transcript of Grab Sampling Systems - Swagelok ... A Swagelok Application Solution Grab Sampling Systems 6 The...

  • • Provides a simple, effective way to safely collect samples

    • Keeps samples in their representative state for analysis

    • Can be adapted to meet system requirements

    Grab Sampling Systems

    Application Guide

  • Swagelok Application Solutions

    Swagelok offers a series of solutions for use in all types of plants and facilities

    where fluids are being processed. Use Swagelok application solutions to create

    fully documented fluid sampling and control systems and bring consistency to your

    operations. Easy to install and operate, these solutions offer the high quality and

    support you expect from Swagelok.

    Grab Sample Cylinders (GSC)

    Features . . . . . . . . . . . . . . . . . . 22

    Outage Tubes . . . . . . . . . . . . . . . 23

    Assembly Descriptions . . . . . . . . 24

    Materials of Construction . . . . . . 25

    Pressure-Temperature Ratings . . 25

    Testing . . . . . . . . . . . . . . . . . . . . 25

    Cleaning and Packaging . . . . . . . 25

    Dimensions . . . . . . . . . . . . . . . . . 26

    Ordering Information . . . . . . . . . . 27

    Liquid-Only Sampling System (GSL)

    Features . . . . . . . . . . . . . . . . . . 28

    Configuring a GSL . . . . . . . . . . . . 28

    System Descriptions . . . . . . . . . . 29

    Materials of Construction . . . . . . 36

    Pressure-Temperature Ratings . . 36

    Testing . . . . . . . . . . . . . . . . . . . . 37

    Cleaning and Packaging . . . . . . . 37

    Flow Data . . . . . . . . . . . . . . . . . . 37

    Dimensions . . . . . . . . . . . . . . . . . 38

    Ordering Information . . . . . . . . . . 40

    Accessories . . . . . . . . . . . . . . . 42

    Glossary - Schematic Symbol Definitions . . . . . . . . . . . . . . 43

    What is Grab Sampling? . . . . . . 3

    Why Use a Grab Sampling System? . . . . . . . . . . . . . . . . . 3

    Sampling Basics . . . . . . . . . . . . 3

    Specifying a Grab Sampling System . . . . . . . . . . . . . . . . . 4

    Grab Sampling System Installation Tips . . . . . . . . . . . 5

    Configurations . . . . . . . . . . . . . 5

    Grab Sample Module (GSM)

    Features . . . . . . . . . . . . . . . . . . . 7

    Configuring a GSM . . . . . . . . . . . . 8

    System Descriptions . . . . . . . . . . . 8

    Materials of Construction . . . . . . 17

    Pressure-Temperature Ratings . . 18

    Testing . . . . . . . . . . . . . . . . . . . . 19

    Cleaning and Packaging . . . . . . . 19

    Flow Data . . . . . . . . . . . . . . . . . . 19

    Dimensions . . . . . . . . . . . . . . . . . 20

    Ordering Information . . . . . . . . . . 21

    Contents

  • A Swagelok Application Solution Grab Sampling Systems

    3

    What is Grab Sampling?

    Grab sampling, also known as lab sampling or spot sampling, is the collecting of a sample

    of liquid or gas in a pipeline, tank, or system with the intent of transporting the sample to a

    laboratory for analysis.

    Why Use a Grab Sampling System? Grab sampling can validate:

    • process conditions

    • end products meet quality specifications

    • online analyzers are “fit for use”

    • product quality during custody transfer

    It can also provide verification of environmental emissions. In all of these uses, capturing a representative sample is essential.

    However, placing a captured sample into an

    open bottle for transport back to the lab may not

    provide a representative sample. Some chemicals

    will evaporate or fractionate if not maintained

    under pressure.

    As more industries bring additional analytical equipment online, it becomes more imperative to

    have quality sample systems that can accurately capture the process for later analysis.

    Sampling Basics

    Sampling is the science of safely capturing a sample from a process or a pipeline while

    maintaining the chemical composition during storage or transport for later analysis. Depending

    on the process phase, temperature, consistency, chemical makeup and other factors, there are

    a variety of approaches that can be used to extract a sample.

    Determining the container type needed is the first decision that must be made in order to select

    the appropriate sampler.

    Captured Phase

    Container Type

    Pressure-Containing Non Pressure-Containing

    Liquid ✓ Cylinder ✓ Cylinder

    ✕ Bottle ✓ Bottle

    Vapor ✓ Cylinder ✓ Cylinder

    ✕ Bottle ✕ Bottle

    ✓ = recommended ✕ = not recommended

    The product selection matrix on page 6 includes additional common system criteria.

    Grab Sampling System with Purge

  • A Swagelok Application Solution Grab Sampling Systems

    4

    Another important aspect is the temperature of the system fluid. Many processes operate at

    elevated temperatures and can pose a hazard from direct scalding during operator interaction

    or from the temperature limits of seats and seals being exceeded. Swagelok recommends

    consideration of a sample cooler when the supply temperature exceeds 140°F (60°C.) Note that

    thermal stability may affect sample integrity.

    Specifying a Grab Sampling System

    The Swagelok grab sampling systems provide solutions to satisfy gas and liquid non-slurry

    sampling service in a consistent, reliable package. Two system types allow for capture into one

    of two types of containers — pressure-containing metal cylinders as found in the Grab Sample

    Module (GSM) or non pressure-containing glass or polyethylene bottles as found in the Liquid

    Only Sampling Module (GSL).

    Given the wide variety of configurations available, there will be several criteria to consider in

    order to properly specify a grab sampling system:

    • Pressure: Each GSM and GSL system has a maximum rated pressure, not to be exceeded.

    Note: The use of a rupture disc or relief valve is recommended with chemicals that may

    rapidly expand and pressurize due to temperature changes.

    • Temperature: Each GSM and GSL system has a maximum fluid operating temperature.

    Note: Some models may have reduced pressure ratings at elevated temperatures. Also,

    some models may have minimum fluid operating temperatures, below which proper

    function cannot be assured.

    • Phase: A cylinder sampler (GSM) can be suitable for either liquid or vapor systems. A bottle

    sampler (GSL) may not prevent the release of vapors and is better suited for most non-volatile

    liquid systems.

    • Hazardous/flammable material: The sampling system must provide sufficient protection for

    the operator and environment from the system fluid. Certain chemicals such as aqueous

    chlorine and pyrophoric compounds require more stringent leak or chemical protection than

    may be provided by a Swagelok GSM or GSL.

    • Materials of Construction (including coatings, etc.): The materials used in the sampling system

    must be compatible with the system fluid. The standard material of construction for Swagelok

    sampling systems is 316 stainless steel. Alternate materials such as alloy 400 are available for

    some configurations.

    • Surface treatments: Surface treatments can reduce the absorption and adsorption of the

    sample fluid into metallic surfaces, leading to a more representative sample. Electropolished

    (EP) tubing is available. In addition to or in place of electropolishing, many coatings can

    be applied to the wetted components: SilcoNert®, Silcolloy®, and Dursan® are frequently

    requested coatings. Contact your authorized sales and service center for details.

    • Purge: Some chemicals may leave residue or contaminate the lines if not flushed from the

    system. Selecting the purge option provides a means to introduce a purge fluid (air, solvent,

    etc.) to remove residual contamination from the sample lines.

  • A Swagelok Application Solution Grab Sampling Systems

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    Grab Sampling System Installation Tips Manual sample systems can be installed to draw from any point along a pressurized line where

    there is enough process or head pressure to drive the sample fluid through the process tubing.

    They may be used in an analyzer bypass or return line.

    If the sample panel requires a return, ensure that the transport line is being returned to a lower

    pressure location, preferably through a separate tap. If the motive force from a pump is being

    used, the return sample can be placed upstream of the pump, as the flow through the pump will

    be sufficient to dilute any sample stream being returned to the process.

    Panels should always be installed so that sample vessels (cylinders or bottles) remain oriented

    vertically. Failure to do so may result in contaminated samples.

    • CAUTION: When installing a Swagelok grab sampling system, position the vent away from operating personnel. Always open vent/purge valves slowly. Operating

    personnel must protect themselves from exposure to system fluid.

    Configurations Swagelok offers two categories of grab sampling systems to fill a variety of intended uses.

    The Grab Sample Module (GSM) is a sampling

    panel using cyl